Fexofenadine (Allerfen@) is the active metabolite of terfenadine.
It is referred to as non-sedating antihistamine with selective peripheral H l-~ceptor antagonist effect, Fexofenadine (Allerfen ) has a rapid long lasting
activity with no anticholinergic effect at the recommended dosage.

Pharmacokinetics :

-Fexofenadine hydrochloride is rapidly absorbed into the body following oral administration with T max occurring 1-3 hours post dose
-Fexofenadine undergoes negligible hepatic and non-hepatic metabolism
-The major route of elimination is believed to be through.biliary excretion.while 10% of the ingested dose is excreted unchanged through the urine